The 74HCT9046A is a PLL chip produced by Philips. It has low power consumption, high accuracy, low drift, and can be used in FM modulation and demodulation, frequency synthesis and multiplication, and frequency discrimination.
The 74HCT9046A is a high‑speed CMOS phase‑locked‑loop IC that integrates a linear VCO, two selectable phase comparators (EXCLUSIVE‑OR and edge‑triggered JK flip‑flop) and an on‑chip bandgap reference. It offers low power consumption, a typical centre frequency of up to 17 MHz at VCC = 5.5 V, and a centre‑frequency tolerance of +10 %.
The device operates from a 4.5 V to 5.5 V supply, provides standard MSI package options, and includes detailed pin descriptions, ordering information, and recommended soldering methods for both through‑hole and surface‑mount packages.
| Supply voltage range | 4.5 V to 5.5 V |
|---|---|
| Centre‑frequency tolerance | +10 % |
| Input capacitance | 3.5 pF |
| C1 value | 40 pF |
| Zero voltage offset | Yes, due to op‑amp buffering |
It can be powered from 4.5 V to 5.5 V.
The centre‑frequency tolerance is specified as +10 %.
The IC provides two phase comparators: an EXCLUSIVE‑OR (PC1) and an edge‑triggered JK flip‑flop (PC2).